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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ec5b798f7712d5b598df46eb6a240feccc9aecae8bbec3eaba21bcb981d9ddc' 
  AND token = 'UN9ly4VT+YgjIHEVMsmgxk94odx269uzG3mJaEn/yo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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