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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '137aad6de5fd01be22b78c9ff0da9df843a5ae1657b88dbe15ac8dd950e7f56a' 
  AND token = '9UltX+GRoMzRfJbcIZXSF5xVwTcL6i/H0NcbMxbUga4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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