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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b12422848e6176583ae34b189bcb84b9597297249f0511d2a5a035f51078b33' 
  AND token = 'MT4nK/dphnW4fLz1MvNxdEcAmvqIyApWEEWkmhWQ2lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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