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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e99b04cca436d15722e41ae48e88b4a705042da5dd8dd9c6b6752cc7069613' 
  AND token = 'u7o0iWh/FFASAumRcXW/+q/nTA12OzEOjSVaVcxN7w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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