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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7263e4eb1a8e206c41b29b94c72fcf480b0e94e0c09d21b1279367ed234d32b' 
  AND token = 'i7/YVys83wWnRIFD+yzz6WkcNlbsH7TfJjmvl3ilAX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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