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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd02d4931719b2c86eac020dddf2ace0ccf5322b82ae3857e51d7dfa2026b08b0' 
  AND token = 'br9xvsvE4mjh6TCHvc4pnifsvKkZF76o63kaxdxHf6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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