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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81a461095e1df056c68f5645a3d1b31088d831f8b16a8e20fc9cb9d11a2fd573' 
  AND token = '0am0+m0fEYOqyZAR8Lo5IKKCRDi677JkP0wyUVAlkZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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