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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948b91b26a368ca3cf3944fb2f2cce88c37d0fb0f12198ba11d3026e7d622953' 
  AND token = 'CeYkmCgTk2Gmuxqm4+Ha/dENyeOV9kbkf+fXCrowHlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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