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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f85f355a907e8e495a7c613bd19088045156d0e92e56d0aa1e031a257a216c' 
  AND token = 'XFOhF9J3oGlCGBdCDhjB5PIYQb42+aiefhhTpzog4i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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