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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61ddca3fb11397ab9b3df46a6e79e7d4ec1d402e2b358bb6bf9970d39d1d1862' 
  AND token = 'Rn4naizLBltxpNYWhZWQ2iFLOHeFks7A/y6UjN6kqfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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