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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55bd49bcac646dd09cca8ea60a0bc0612030ea2a2fc9b97a106c9690d4e7638' 
  AND token = 'j84PulDgUz4iEBFMD4oWP79qa1tz2mzs+r8GTwqH/qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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