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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93699ed61bf585a655beeec5d3da2a26f65162d548a3685690d7a1f2eea04f46' 
  AND token = '1YusvRLrB0rMb/B00gUfdG06xMqRqAIJ0bhBrhcIJpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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