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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca3c97fe592924ee02c1a0c9f9e37630fddc57d3c2125fb3f06b6b9fa188e33' 
  AND token = 'p90LzfZSoi8A0vMGSZrYKJxAhr3bw5UMuwuAAJ7nkc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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