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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c5850c7b6900594ec2824e6254bdc8c6aeaddaf152fbde5a77eeec4c9d1db0b' 
  AND token = 'uraxyNjb5kM4K9cmfyhcVzvY/ij1gcKNmB6dUnxBTXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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