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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef61b2dfcf0c8f475ca60096fa968e65fa6c7bcd3e093ad2d561fa79cbc2c742' 
  AND token = 'DYCpSEQzGbQ1zYBRliv+9xNOAvh6844ksi3I+8+X4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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