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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e41bc4046601ab044480c23afe42972e1c23f5d8ac4f2f81731da18daec3ecb' 
  AND token = 'RJ8sgu1ZXnxQz/gzvmfOvfpmXT0IKr1azE1sDnl7ZLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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