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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0bf1c97f3b196dd0020a37bc7d14d24fb1e6de3bcb520481258f93f71465f22' 
  AND token = 'ptJqiRay+jB+P3CmGta7K6IsENeh3KhTTOioymEaClI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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