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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c655d1c45cbbf2ce6df317dde2e0c95c3026403e7490df4cd41640fd54f23096' 
  AND token = 'm8aSmKy+OAexFxwf06boQuSrSbIx6yL3JqNDS4qiqEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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