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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ac59cc19d1e83cd63c889f5369db515f16d8c0aec6505537175896afd54cfe0' 
  AND token = '7r2kUyP+s8x2a4/ho+98kTlPW8drhDkraPIfEl+7sN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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