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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de6364a3ac1945dae0a0f7a5508366eaf2ae5f7a9f0d1c346d8479a9715e2648' 
  AND token = 'zzavsuFk0yzM50F7+YSMKSUzI+dOqqcQhFHCxBK4zC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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