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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23f356b6578fafeb07ff6d8408fd5bf653b6cf338209492c8d5f993913dd3438' 
  AND token = 'y4qBYQsKLIk8ZAxXWz1HS1eu2h5dozb1hWKIIr6pXZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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