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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd1c494dc7d009140564bc0e3af74ae7d421450494166fcd4477532d89c074f4' 
  AND token = 'RoX8nWI2MOsdI8qdntM7x1Uframs++YqKbvOMhZYVmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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