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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27033fbba8e46ef9c8551769f8616e62ffabddcfd76841b32ca6dbb26a8e1b01' 
  AND token = 'R8llU9e5oiW/N1Oj+EYnnYUdAyT1oTnfUaGVMVNEem0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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