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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '137c3d0d4044183b64aef8d48b8948a3ae01c70ff1c26a0198a83286c96c4c0c' 
  AND token = 'fGPP2onbgmvQgu6i6IzuqzfdvjlaJ9bpKoYdLer5r6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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