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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b260d7ec585d9ab65d618e442407c11344885a8fe98600cfa40d24f8c18e8588' 
  AND token = 'Ssdj/Df6nCqsjhgWvrNtc/DVi5lEzkC0vS7nq8sScOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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