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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5499b16f69b5bb31db02336d5de1104065d744eccc0c697a307497e5ef830ce9' 
  AND token = '/vxIqWlnvu7X9TyPEXdzvWbcuGAKxZAB8smLWuIn6z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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