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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f11a56fffe68989163f4b1a9e4becf3dcfcfc05bfed543c0e8f6546207012c7' 
  AND token = 'zBX8C2OYwcFs2qK355MSTyJiYf3izIkdsM3sTM+hXZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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