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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab21447cc32d33669e625eadb177ca0f2ec351cf578f3c11511b5408ffff80e' 
  AND token = 'ITT4r060nI/8h48lSgynNrMlzoKrB2ox5xJ9aAz1RoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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