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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e4edbe55445b41ae2d9ec2f0b53502ad03b14f0110e034689cd7fd67bdc3d2' 
  AND token = 'LlXVsm/aMcXXexC81/oNd33848wabJmLIFZXEBFz6HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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