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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42ebc1adc91c2e3dea8a8b42e3e5bf70b02c4e14dc894f530f01a77bea85d979' 
  AND token = 'a0Y0cZR2gBPaW0Pn4AJUhl7F1/AFyjEIw9TU7YQ6EP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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