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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '080b3547fd94cb2c0f284d19caa647372e26a2d834f0cf371613f4f2d405f681' 
  AND token = '5TmY2+g6rJZ6cgAQ5SXNXNhA9OXv8Dob1xECRFDMdgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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