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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c58e752832dfdc4b0861a04aebd1328dd38aeb582be580bceee9f9cc8a98ef' 
  AND token = '/KZIXP+B2JPKloksVGWlQ2CA2cUE92fqdE4857zC7LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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