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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c25047b22cf32dabc4d5019750ffece5e71f2a06d340a0a73d95d5d2deed33' 
  AND token = 'sA6qWFSAC6aWcTzjZRUezaEymhU+i3Pu+j3tkrdCCGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}