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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd05e15a1d63ac0e9be1624ea2e3394a9dd60641db039d90e040e6be3503946af' 
  AND token = 'XzmFmWNwNhQ3GsLBJ6ivXGATbZesgOL9OMiRNLdkvNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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