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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b3fd76c20f7b39550fc7dc335e3ba1570c0d1a65a2f08f5b5f99cefe666ea91' 
  AND token = 'fPVDTwpKG8bZvxi/2pHmbX8ZsATZ3y4tTFxa8AHj3Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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