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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48eab63ab0bd2fa4c866ec8b5ac4b5af1433424d23326f0da91d3d489d1438a0' 
  AND token = '94IK88ahimjdGQ3XgZPOsnJ/UNEXXU25YfKubnOLGe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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