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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1b660335763a80b1bd9644b10850606ca47bc7d2cb292b5b9c4ee3420feeab3' 
  AND token = 'tYT8pkVb+CU4Uuvi+sPTher6aZOQh15FIlJdLK62J4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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