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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b120aef9f1f1fe273133339f83e3d80c712d0d3e2c28733c388b807451d9f4fe' 
  AND token = 'KT3TbimqyoKFoJYTRLp50TSvAB03bFxABBUBDHHisrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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