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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b10b8e6c22e7add1d3030bf6263abdd671af9f6170700a3056d25b128c752bb' 
  AND token = 'd9lDCRnZmFsuNdsYQkdmRkn0f6anm7OoDX2QJzxB5bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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