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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce26dcab068960a35c02030c3b3d5f4ef1d9267b562d3db6ab958bc64a2169f' 
  AND token = 'C3qLr8jBiJaWcJGk6DM3TrbTTZRI00XJMwDfZ3acOwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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