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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '273b34dd5a1c6af7b1586cecc35b9bd9788b80be3b47de83b91be31c83791ce3' 
  AND token = 'XATNXbvqkgiix5KvAEer4RHBT5+VzgyOKdWQnLtSudk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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