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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1de634fde0ec1113324244c5445463c8beee773a339131bdf52066fcf158b5' 
  AND token = 'Y220e30gqNuvRB5vvF9zPC5JBQ1Ca3eLQuKUJEt+9pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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