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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c830926da8bde77ff1e17191dcbf6919b423328a906b80015d76f54a01d0ef1' 
  AND token = 'L9gswALawZd7IHvAanQ5eEB+iyIM1Ia+hczYNHRvrnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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