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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cee0a61406ce7ae2217a200dabc63153bfc905ceec050c51074b8627184f6e69' 
  AND token = 'WsxmP/ScJf73ozSK7jUvbqkl9ixT7/pog9DB3WyO4sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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