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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d6dcd0cae1294359a446f4e211b736a852c8e91578c50722f61df5d744fced7' 
  AND token = 'V0x4B5OOIR0+3XYXnJvORwyfaRLz+2kbXLBJX9NH5Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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