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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a196982ecc4c71fa8a0c6fc9c940f15930e1c9ac7c3ce9eb9770082b309b00' 
  AND token = 'j2y9W7lqBaPZoGpeSQqrtAZlDtilpHR/OuF74ngeL3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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