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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b1cbbe24317b71f580d5b567c830d1a0ae8e41e71bec14bfb060395e08589a8' 
  AND token = 'iBnpkMYSPwQO0COiCOvhDFh06QrTEpHxpxLmR7BfZO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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