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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b924a13c7499ec2c742ace76fe7a242b7156e31019bd0cb9c743d5fa4bb5cf9' 
  AND token = 'IC65+3kMPqw6cTEzdsB39U8iyc/tk8iYTwjXZTUsUCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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