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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a20d48e5f4149f68b93c536ac1f0a1e6952ff7e6eb981c7ae9e1cb96e087c34' 
  AND token = 'T9r6k0RnRhKctOgEPe1iGeVy25REBKqVX0j9hmREwFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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