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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4924cad37baaa24c2a7f9cda4f134bc96242cb969a6de8683471bfec1981886' 
  AND token = '1RJEGrpNQ8psVJAQ7mGK33FuzRRaY8FNbZpYW/wjmmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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