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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae384d901401fdbecb396eb4beded12ba84f496ed567bb1649cc580d39bec059' 
  AND token = '3NobOxfvOs1d2f5fI8DBgDa/g1t6h/ygUJ/QnRCQ+js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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