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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834efc130fe0524db80af0d0b1563851755be2e9d0b8d05610201f64cffd352d' 
  AND token = 'hyU3ilwT7n4JU2SU1X+DCkGF0bSn/rtazV4pQtNXU7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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