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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf67ad1552cf3aed2b33fba434d45d2dc0b5cd6826ca1d20e80b188ec186266f' 
  AND token = 'e8u0TRrMP6G2AgUDY/it2B0iIJj/mJPoTSawnwEj0lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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