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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c757f2b105b48dddc7ae87ab9ed1d75a0b02386fa5a6feae4b0d7f87afbb97e4' 
  AND token = 'CgmsS4brxu27ToSoeb+lypRVpmcZLTsGjP0fapqF4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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