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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '360014c018cd7a850669a48a42c9473e38a5643ec009bbf2b3f1ba5d1186585a' 
  AND token = '2QsS/AFoql0fjYFE0lsSwi9tImBDYdbyMjAQBUUp4KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00283

JSON explain

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