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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0630587a73d3e82387a12116ae1dd264ba9484615699fa6bd71e8c4b4dadd55' 
  AND token = 'J+PnehRRnReDIiiT/By7an394SBEZqx3YBxrnRx/zRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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