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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1927b698d4ec0bbbb4f86345041742e479f64187348dd4992e95bade59c0655e' 
  AND token = 'TGVjQyQraedcnPwv7Dhm1mmK4DzEdsRc5CE6pZVwXyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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