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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60b3973b2989b2ef4418879d92eef97df5b063eba1ac0cdb8dd5958e7f01bb6f' 
  AND token = '3JmeSBLo41+YF7e9prK7/mEE6zdcj8rkwBX3M4Dc84Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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