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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b7024e74fa4bd40871e2f3234a4fc9c471eb0156c0315c89f6908e1879e40fc' 
  AND token = 'U+gej01UsAnLrDDTkoD1adOzA9oPhW+mszeiVJoM2jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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