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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cb6e3af29755a893106ae2339f0101d2f0b5407005017a33d5e22af54a7114c' 
  AND token = '5ttoGr86uLAbwBI9oIQd/RF7ErEQicH4OR/9gQOLHUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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